zip() stacks two lists and creates an one-time iterator. This iterator could be used only once.
a = range(5)
b = range(5)
iter1 = zip(a,b)
print(list(iter1)) # working
print(list(iter1)) # empty-iterator
Output:
[(0, 0), (1, 1), (2, 2), (3, 3), (4, 4)]
[]
If we want to reuse the result, we could list() the iterator.
a = range(5)
b = range(5)
iter1 = list(zip(a,b))
print(list(iter1)) # working
print(list(iter1)) # working
Output:
[(0, 0), (1, 1), (2, 2), (3, 3), (4, 4)]
[(0, 0), (1, 1), (2, 2), (3, 3), (4, 4)]
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